3rd round of IIO fixes for the 4.2 cycle.

* bmc150_magn - add missing regmap dependency and ensure on a wrong chip
  case report hte chip id rather than a previous return value.
* mmc35240 - Fill a null pointer derefrence and wrong SET / RESET logic
  that results in North and South being swapped.
* mlx96014 - correct the offset value reported to userspace (wrong sign)
* vf610 - Prevent non aligned register reading.
* mcp320x - Another null pointer deference bug.
* mma8452 - change threshold type from THRESH to MAG to reflect the fact
  that the sign of the signal is not known when the event is signaled.
* stk3310 - move device registert to end of probe to avoid race conditions
  when coming up, check for invalid client->irq values and make it work
  for both endian types of host.
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